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SVEN [57.7K]
3 years ago
8

An alarm clock is placed in a sealed container without any air. Describe what you will observe concerning the mechanical waves a

nd the EM waves when the alarm clock goes off.
Chemistry
1 answer:
finlep [7]3 years ago
5 0
You wont hear the sound from it because the sound is caused by vibrating the air molecules. this wont make a sound because the vibrations don't have a medium to travel through.
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The balanced chemical equation below shows the combustion reaction of butane (C₄H₁₀). What is the mole ratio of butane (C₄H₁₀) t
Y_Kistochka [10]
I believe that the correct answer is 13:10
8 0
3 years ago
Read 2 more answers
A car traveling at a speed of 30.0 m/s encounters an emergency and comes to a complete stop in 7.5 seconds? What is the cars acc
Marianna [84]

Answer:

The acceleration is: 4m/s^2

Explanation:

Given

u = 30.0m/s --- The initial velocity

t = 7.5s --- time

v = 0m/s -- The final velocity

Required

Determine the acceleration

To do this, we make use of the first equation of motion

v = u - at

We used negative because the car was coming to stop.

This gives:

0 = 30 - 7.5 * a

0 = 30 - 7.5a

Collect like terms

7.5a = 30

Solve for a

a = \frac{30}{7.5}

a = 4m/s^2

6 0
3 years ago
The heat of fusion for a substance is 122 joules per gram. How many joules of heat are need to melt 7.50 grams of this substance
daser333 [38]
<h3>Answer:</h3>

915 Joules

<h3>Explanation:</h3>
  • The heat of fusion is the heat that is required to convert a given mass of a substance from solid state to liquid state without change in temperature.
  • In this case, we are given specific heat of a substance as 122 joules per gram
  • It means that amount of heat equivalent to 122 joules is required to change 1 gram of the substance from solid state to liquid state.
  • Therefore, we can determine the amount of heat needed to change 7.5 grams of the substance from solid to liquid state.

1 g = 122 Joules

7.5 g = ?

       = 122 × 7.5

      = 915 Joules

Thus, 7.5 g of the substance at its melting point will require 915 Joules of heat to melt.

4 0
3 years ago
For which process would the pictured cell be used?
DaniilM [7]

Answer:

Coating a material with metal

(SInce the glasses will be coated with gold.)

3 0
1 year ago
Can someone please help as soon as possible
Kobotan [32]

Answer:

Explanation:

#1 2HCL and 2H20

4 0
3 years ago
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